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[Davim <luis.davim@xxxxxxxxx>]

I have the same problem with an Apple 25'' Thunderbolt display and a
MacBookPro9,2 running ubuntu 14.04.

The display can only be detected during boot.
If I unplug the monitor while it's working ubuntu freezes
If I plug the monitor after the boot process nothing happens.

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https://bugs.launchpad.net/bugs/1183089

Title:
  xorg freezes on macbook air unplugging thunderbolt display

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Xorg hangs on macbook air mid 2012 when the external thunderbolt display is being unplugged.
  Also, when I try to boot without the external display, the OS hangs immediately on the kernel boot splash.

  If I then plug the display in again,  the OS unfreezes and continues
  to run just fine.

  The lockup is hard, so machine becomes unaccessible via the network.

  Started to happen after a month or so of running Ubuntu. OSX is not susceptible to any of the mentioned problems.
  Clearing NVRAM and applying latest firmware updates doesn't help.

  This is what I see in dmesg:

  [   12.330919] ------------[ cut here ]------------
  [   12.330950] WARNING: at /build/buildd/linux-3.8.0/drivers/gpu/drm/i915/intel_display.c:5377 ironlake_crtc_mode_set+0x88a/0x8b0 [i915]()
  [   12.330952] Hardware name: MacBookAir5,2
  [   12.330953] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_cirrus pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) parport_pc(F) bnep ppd
  ev(F) hid_generic btusb rfcomm bluetooth snd_hda_intel snd_hda_codec snd_hwdep(F) snd_pcm(F) hid_apple joydev(F) snd_page_alloc(F) coretemp binfmt_misc(F) kvm_
  intel snd_seq_midi(F) arc4(F) kvm snd_seq_midi_event(F) brcmsmac uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel(F) usbhid videobuf2_core bcm59
  74 cordic(F) usb_storage(F) brcmutil hid snd_rawmidi(F) nls_iso8859_1(F) snd_seq(F) aesni_intel(F) videodev aes_x86_64(F) xts(F) lrw(F) gf128mul(F) ablk_helper
  (F) cryptd(F) mac80211 cfg80211 i915 snd_seq_device(F) snd_timer(F) drm_kms_helper apple_bl drm video(F) i2c_algo_bit applesmc lpc_ich mac_hid snd(F) input_pol
  ldev soundcore(F) bcma mei lp(F) microcode(F) parport(F) ahci(F) libahci(F)
  [   12.330999] Pid: 1191, comm: Xorg Tainted: GF          O 3.8.0-21-generic #32-Ubuntu
  [   12.331000] Call Trace:
  [   12.331008]  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
  [   12.331010]  [<ffffffff8105884a>] warn_slowpath_null+0x1a/0x20
  [   12.331024]  [<ffffffffa015409a>] ironlake_crtc_mode_set+0x88a/0x8b0 [i915]
  [   12.331039]  [<ffffffffa015861b>] intel_set_mode+0x63b/0xa30 [i915]
  [   12.331053]  [<ffffffffa0159126>] intel_crtc_set_config+0x716/0x950 [i915]
  [   12.331068]  [<ffffffffa00d6c11>] drm_mode_setcrtc+0x121/0x5a0 [drm]
  [   12.331079]  [<ffffffffa00c7559>] drm_ioctl+0x4e9/0x5b0 [drm]
  [   12.331093]  [<ffffffffa00d6af0>] ? drm_mode_setplane+0x370/0x370 [drm]
  [   12.331098]  [<ffffffff811a5969>] do_vfs_ioctl+0x99/0x570
  [   12.331101]  [<ffffffff811a5ed1>] sys_ioctl+0x91/0xb0
  [   12.331105]  [<ffffffff816d37dd>] system_call_fastpath+0x1a/0x1f
  [   12.331108] ---[ end trace 917b1961459e15ea ]---

  
  Looks like some modesetting bug.

  The same happens on fresh installations of both 12.10 and 13.04 and
  even when I boot from live CD/USB.

  Additional information:

  ----------------------------------------------------------------------
  knazarov:~/ $ sudo lshw -C display                                                                                                                   [0:32:29]
  [sudo] password for knazarov: 
    *-display               
         description: VGA compatible controller
         product: 3rd Gen Core processor Graphics Controller
         vendor: Intel Corporation
         physical id: 2
         bus info: pci@0000:00:02.0
         version: 09
         width: 64 bits
         clock: 33MHz
         capabilities: msi pm vga_controller bus_master cap_list rom
         configuration: driver=i915 latency=0
         resources: irq:46 memory:a0000000-a03fffff memory:90000000-9fffffff ioport:2000(size=64)

  ----------------------------------------------------------------------
  knazarov:~/ $ lsb_release -a                                                                                                                         [0:37:47]
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 13.04
  Release:	13.04
  Codename:	raring

  ----------------------------------------------------------------------
  knazarov:~/ $ uname -a                                                                                                                               [0:37:51]
  Linux kn 3.8.0-21-generic #32-Ubuntu SMP Tue May 14 22:16:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

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